[Before, he might have responded with avoidance or changed the subject, but he knows Dou and he knows he won't let this go, not now, not anymore. So he turns to look at him, sharp, his eyes gleaming in something that's too much like barely-held-back desperation, an edge to his voice that wasn't there before]
Even if I can walk around in this place, it's still the same-- I'm still tied to the shop, my time will be different... I'm not even sure if I can be considered fully human anymore. I'm not the same as you and Himawari-chan. Not anymore.
[Which is why it won't do, it won't work, he'll go back and forget again, or either of you will, and it will just be painful for everyone.]